- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄224115 > LTC4011CFE#TRPBF (LINEAR TECHNOLOGY CORP) High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C PDF資料下載
參數(shù)資料
| 型號： | LTC4011CFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 653K |
| 代理商： | LTC4011CFE#TRPBF |
第1頁第2頁第3頁第4頁第5頁第6頁當(dāng)前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁
LTC4011
4011fb
applicaTions inForMaTion
ExternalDCSource
TheexternalDCpowersourceshouldbeconnectedtothe
chargingsystemandtheVCCpinthrougheitherapower
diodeorP-channelMOSFET.Thispreventscatastrophic
systemdamageintheeventofaninputshorttogroundor
reverse-voltagepolarityattheDCinput.TheLTC4011auto-
maticallysenseswhenthisinputispresent.Theopen-circuit
voltageoftheDCsourceshouldbebetween4.5Vand34V,
dependingonthenumberofcellsbeingcharged.Inorder
toavoidlowdropoutoperation,ensure100%capacityat
chargetermination,andallowreliabledetectionofbattery
insertion,removalorovervoltage,thefollowingequation
canbeusedtodeterminetheminimumfull-loadvoltagethat
shouldbeprovidedbytheexternalDCpowersource.
DCIN(MIN)=(n2V)+0.3V
wherenisthenumberofseriescellsinthebatterypack.
The LTC4011 will properly charge over a wide range
of DCIN and BAT voltage combinations. Operating the
LTC4011inlowdropoutorwithDCINmuchgreaterthan
BATwillforcethePWMfrequencytobemuchlessthan
550kHz.TheLTC4011disableschargingandsetsafault
ifalargeDCINtoBATdifferentialwouldcausegeneration
ofaudiblenoise.
PowerPathControl
ProperPowerPathcontrolisanimportantconsideration
whenfastchargingnickelcells.Thiscontrolensuresthat
thesystemloadremainspoweredatalltimes,butthat
normalsystemoperationandassociatedloadtransients
donotadverselyaffectfastchargetermination.Forhigh
efficiencyandlowdropoutapplications,theLTC4011can
providegatedrivefromtheINFETpindirectlytoaninput
P-channelMOSFET.
Thebatteryshouldalsobeconnectedtotherawsystem
supply by a switch that selects the battery for system
poweronlyifanexternalDCsourceisnotpresent.Again,
forapplicationsrequiringhigherefficiency,aP-channel
MOSFETwithitsgatedrivenfromtheDCinputcanbeused
toperformthisswitchingfunction(seeFigure8).Gate
voltageclampingmaybenecessaryonanexternalPMOS
transistorusedinthismannerathigherinputvoltages.
Alternatively,adiodecanbeusedinplaceofthisFET.
BatteryChemistrySelection
Thedesiredbatterychemistryisselectedbyprogramming
theCHEMpintothepropervoltage.IfitiswiredtoGND,
asetofparametersspecifictochargingNiMHcellsis
selected.WhenCHEMisleftfloatingorconnectedtoVRT,
chargingisoptimizedforNiCdcells.Thevariouscharging
parametersaredetailedinTable2.
ProgrammingChargeCurrent
Charge current is programmed using the following
equation:
R
mV
I
SENSE
PROG
=
100
RSENSE is an external resistor connected between the
SENSEandBATpins.A1%resistorwithalowtemperature
coefficientandsufficientpowerdissipationcapabilityto
avoidself-heatingeffectsisrecommended.Chargerate
shouldbebetweenapproximatelyC/2and2C.
InductorValueSelection
Formanyapplications,10Hrepresentsanoptimumvalue
fortheinductorthePWMusestogeneratechargecurrent.
ForapplicationswithIPROGof1.5Aorgreaterrunning
fromanexternalDCsourceof15Vorless,valuesbetween
5Hand7.5Hcanoftenbeselected.Forwideroperating
conditionsthefollowingequationcanbeusedasaguide
forselectingtheminimuminductorvalue.
L>6.510–6VDCINRSENSE,L≥4.7H
Actualpartselectionshouldaccountforbothmanufacturing
toleranceandtemperaturecoefficienttoensurethismini-
mum.Agoodinitialselectioncanbemadebymultiplying
thecalculatedminimumby1.4androundingupordown
totheneareststandardinductancevalue.
Ultimately,thereisnosubstituteforbenchevaluationof
theselectedinductorinthetargetapplication,whichcan
alsobeaffectedbyotherenvironmentalfactorssuchas
ambient operating temperature. Using inductor values
lowerthanrecommendedbytheequationshownabove
canresultinafaultconditionatthestartofprechargeor
top-offcharge.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4050EMS-4.1#PBF | Lithium-Ion Linear Battery Charger Controller with Thermistor Interface; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +125°C |
| LTC4050EMS-4.1#TRPBF | Lithium-Ion Linear Battery Charger Controller with Thermistor Interface; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +125°C |
| LTC4050EMS-4.2#PBF | Lithium-Ion Linear Battery Charger Controller with Thermistor Interface; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +125°C |
| LTC4052EMS8E-4.2#PBF | Lithium-Ion Battery Pulse Charger with Overcurrent Protection; Package: MSOP; No of Pins: 8; Temperature Range: -40°C to +125°C |
| LTC4052EMS8E-4.2#TRPBF | Lithium-Ion Battery Pulse Charger with Overcurrent Protection; Package: MSOP; No of Pins: 8; Temperature Range: -40°C to +125°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4011EFE | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4012 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。